Drilling Tools
Look at the pictures. You can see different drilling tools and operations. Then read sentences - descriptions of the pictures -given below. They are presented in the random order. Choose the description that matches each of the pictures. Arrange them in the correct order. Put down a number of a picture and letters of the sentences which, you think, correspond it best. (Hint: the number of sentences is more than the number of pictures. So, you may choose several sentences to describe one picture.)
Drilling for Oil
Chapter Three a. Length after length of pipe, covered with mud, is pulled out of the b. There are many kinds of bits for different types of rocks. c. Above is a sample of rock core which has been brought up from d. Drillers call the job of changing a bit, a "trip". e. This is only a small part of all the equipment needed. f. Workmen in Austria are carrying a spiral bit. g. After the change is made, down they all go again. h. It will be examined and studied to get some idea of the layer of rock the drill is cutting through. i. This is the bit that bores through the earth, and you can also see how closely all members of the crew must work together. j. In this Louisiana, USA, storeroom, you can see gathered together the dozens of shapes and sizes of all the different small tools needed for drilling. k. They become dull or clogged, or a grinding head can break off at the bottom of the hole. I. The cost of drilling a well ranges from fifty thousand to one million dollars. m. Bits are changed often. n. It, and many later ones, cut by a special bit as drilling goes on, will be sent to the laboratory where further study of the samples can give enough information to chart a kind of picture of the underground. o. These are only some of the 601 bits used to drill a well in Canada that turned out to be a dry well, which means no oil was found. p. When no oil is found and it is decided to give up, it is a very sad day indeed for all concerned.
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